9 Answers votes newest views recent 5Most interesting mathematics mistake? 2“Plateaus” to watch out for 2How to respond to “I was never much good at maths at school.” 2Existence of a zero-sum subset 2Best way to teach concept of real numbers using a hands-on activity? 1Is the product of first $n$ prime numbers $+1$ another prime number? 0Defining ‘free monoid’ without Nat? 0For which integers u,v does au=bv *approximately*? -1How to see the ring of all polynomials (with integer coefficients) that are bounded on a given real algebraic set?